"Pennsylvania, County Marriages, 1885-1950," database with images, FamilySearch, William S. Pierce and Catherine Ehmer, 22 Feb. 1900; citing Marriage, Pittsburgh, Allegheny County, Pennsylvania, multiple County Clerks, Pennsylvania.
"United States Census, 1880," database with images, FamilySearch, William Pears in household of John C Pears, Pittsburgh, Allegheny County, Pennsylvania; citing enumeration district (ED) 147, sheet 463A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration), FHL microfilm 1,255,094.
"United States Census, 1900," database with images, FamilySearch (accessed 17 April 2020), Wm Pierce, Precinct 2 Pittsburgh, Ward 31, Allegheny County, Pennsylvania; citing ED 308, sheet 7A, family 135, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972); FHL microfilm 1,241,364.
"United States Census, 1910," database with images, FamilySearch (accessed 17 April 2020), William Pierce, Pittsburgh Ward 18, Allegheny County, Pennsylvania; citing ED 522, sheet 7B, family 154, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, 1982), roll 1305; FHL microfilm 1,375,318.
"United States Census, 1920," database with images, FamilySearch (accessed 17 April 2020), William Pierce, Knoxville, Allegheny County, Pennsylvania; citing ED 165, sheet 4A, line 46, family 80, NARA microfilm publication T625 (Washington, D.C.: National Archives and Records Administration, 1992), roll 1513; FHL microfilm 1,821,513.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch, William Sarsfield Pierce, 1918.
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: